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40litres per 100klm is a lot.
Haven't got a brake dragging, you would smell it I'm sure.
Blocked air intake of filters.
How is the performance?
A coolant system flush and refill with a good coolant wouldn't go astray but that wont make a huge difference to the fuel.
Slow road speed (both a/c on, mainly first and second gear...) will reduce airflow through the radiator, viscous coupling could be an issue.
Be interesting to see what a flush and an electric fan would do.
Ambient air temp might not help as well.
When you say Dhaka is that Bangladesh? Had a great stay there in 1983 when backpacking.
Good luck Tom